Telegraphic repeater



(No Model.) l I W. 1v1fr MINER.

TBLEGRAPHIG REPEATBL No. 331,250. Patented NovI 24, 1885.

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winnaar) M. Minna, "or THURLOW, PENNSYLVANIA.

TELEGRAPHIC REPEATER.

SPIZCIFICATEON forming part of Letters Patent No. 331,250, dated November 24, 1.885.

Applicaticn filed July 8, 1855,

Serial No, 170,930. (No model.) v

To alt whom it may concern: 1

Be it known that l, WILLARD M. MINER, of Thurlow, in the county of Delaware and State of Pennsylvania, have invented a newv and useful Improvement in Telegraphic Repeaters, of which the following is a specification.

My invention has reference to telegraphic repeaters; andit consists in certain improvements fully set forth in the following specication,and shown in the accompanying drawings, which form part thereof. Telegraphic repeaters as heretofore constructed were complicated, involving a large number of adjustments before being operative, the delicacy of which adjustments was such that very few operators were capable of keeping the instrument in working condition.

The object of myinvention is to so simplify a repeater that it shall be extremely simple, involving the use of but two instruments devoid of complications, the adjustments thereof being similar to Ythose of a simple relay or sounder. By this it is seen that the repeater is very inexpensive to make, and any ordinary operator might withbut very little practice quickly adjust it to suit lines of various resistances.

In the drawing is shown an elevation of the two repeating-instruments proper, and a diagram representing the circuits, connections, batteries, keys, 8vo.

A and Brepresent two main lines united by the repeating-instruments and connections.

C are the main batteries.

D and D represent two keys for making and breaking the main-line circuits, and are connected, respectively, by wires K and K', with contact-screws J on the repeating instruments proper, E E', and contact-pins p of switches Q.

E and E' represent the repeating-instruments proper,which are both made alike, consisting of the electro-magnet F, which attracts an armature-lever, G, whose movement is limited by screws `W, and is furnished with a back contact, H, which,when the armature is drawn away from the electro-magnet by the spring M, closes the circuit through the spring I, drawing it away from contact with the contact-screw J, which spring lis connected by switch-lever Q, connecting with line'A and instrument E,Iis connectedby wire R with the electro-magnet F of the instrument E,and the other pole of the said electro-magnet is connected by awire, O, withthe ground. The electro-magnet F of the instrument E is coupled up in a similar manner with the switch Q, connecting lwith thelineB -and instrument E and the levers G of the saidinstrumentsE y wir@ L with Contact Pof the switch a. The

Aclose examination of the instruments E f and E will show that they are substantially similar to any sounder or relay,with an additional back Contact to switch a current over two different paths, or two currents over the A same path, without breaking it or them both at the same time.

If desired, the instruments E and E may be used as Sounders, in which case the armature G, striking between the stop-screws W, gives the sound, or they may be used as relays, in which case a local circuit, S, having a local battery, T, and a sounder, U, in circuit therewith, may beV made or broken by the armature G playing between the contact-screw W. In

this latter case the upper or lower screw should be insulated, so that the armature G only com- 1 pletes the local circuit when drawn down.

When the switches Q are turned so as to be upon the contacts p, as indicated in dotted lines, then the instruments E and E' are drirectly in circuit, respectively, with the lines lB and A, and may be operated like any ordinary sounder or relay, each acting as a terminal instrument to its line without repeating; but when the switches are turned to contacts p, as shown in solid lines, then the current from either line is caused to pass through the repeating-points of one of the instruments E and E and through the electro-magnet F of the other of said instruments.

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If the key D in line A is closed and a message is beingv sent by key D in line B, and if we consider said key D open the current from line A will be broken by the back contact H of instrument E pressing the spring I away from contact J g hence no current from line A passes through magnet F of instrument E, and when key D is open, as shown, the current from line B is broken; but one of the local batteries N acts through its circuit N, contacts H I of instrument E, wire L, switch Q, and wire B, through electro-magnet F of instrument E which thus energized holds down its armature, keeping closed the circuit through Contact J and I of line B. Now, should the key D be depressed, the current from line B will pass through wire K, contacts I J of instrument E', wire L, switch Q, wire R, through electro-magnet F of instrument E, and by O to ground. This will energize the electro-magnet F of instrument E and the armature G will be depressed, raising the contact H and bringing contacts I and J together,which action closes line A through wire K, contacts J I of instrument E, wire L, switch Q, wire R, electro-magnet F of instrument E, by Oto ground. From this it is seen that by either opening or closing the key D the electro-magnet F of instrument E always remains energized, so as to keep the contacts J and I closed, the said magnet being energized either by the current in the line A or the battery N in thecircuit N, and so long as the magnet of the instrument E remains energized and the armature in the position shown, the impulses given by the action of the key D will be repeated in the line A by the vibration of the armature G of instrument E, which alternately opens the line-circuit A and the circuit N, but never both at the same time;hence the proper impulses are sent down the line A without disturbing the position ofthe armature G of the instrument E, as electro-magnet F always remains energized so long as the key D is not operated. The same effect will take place if key D be closed and the key D operated, only in this case the lever G of instrument E will remain attracted while the lever G of instrument E will be vibrated.

The switches Q maybe connected or coupled together, if so desired, so that both may be operated simultaneously, and the particular construction of the instruments E and E', is immaterial, as the details thereof may be modied in various ways without departing from my invention.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1'. The combination, with the lines A and B and their keys, of instruments E E', each consisting of electro-magnets F, armature G, contacts H I J, wires K, connecting the lines with the contacts J, wires L R, connecting the contacts I on one instrument with the electro-magnet on the other, and circuits N, having batteries N and connecting contacts H of one instrument in circuit with the electro-magnet F of the other instrument, substantially as and for the purpose specified.

2. The combination, with the lines A B and their keys, of instruments E E', each consisting of electromagnet F, armature G, con; tacts H I J, wires K, connecting the lines with the contacts J, wires L R, connecting the coutacts I on one instrument with the electromagnet on the other, circuits N, having batteries N', connecting contactH of one instrument in circuit with the electro-magnet F of 8o the other instrument, wires K', connecting with each of said lines, and switches Q to connect the electro-magnets F in circuit with either wires K or L, substantially as and for the purpose specified.

3. The combination of the lines A B and their keys with instruments E E', each consisting of electro-magnets F, armature G, contacts H I J, wires K, connecting the lines with the contacts J, wires L R, connecting the contacts I on one instrument with the electro-magnet on the other, circuits N, having batteries N', connecting contacts H of one instrument in circuit with the electro-magnet F of the other instrument, and a local circuit having a sounder or other instrument located therein and controlled by the vibrations of the armature of the instrument E, substantially as and for the purpose specified.

4. In a telegraphic repeater, two electromagnets, armatures therefor having each two circuit-closing contacts, one of which closes when the armatures are up, and the other when the armature is down, but in which both contacts in one instrument are never both opened at the same time, two line-circuits connecting, respectively, with one or the other of the contacts of said instruments, according as to whether the armature is up or down, lines connecting one of said contacts on each instrument with the electromagnet of the other instrument, and local circuits having batteries connecting the other contact of each instrument with the electromagnet of the other instrument, substantially as and for the purpose specified.

In testimony of which invention I hereunto set my hand.

WILLARD M. MIN ER.

Witnesses:

R. M. HUNTER, ANDREW ZANE, Jr.

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